/* 清除浮动 */
.clearboth{clear: both;}
.clearfix{ *zoom: 1;}
.clearfix:before, .clearfix:after { display: table; line-height: 0; content: "";}
.clearfix:after {clear: both;}

/* 定位 */
.fl{float: left;}
.fr{float: right;}
.pr{position: relative;}
.pa{position: absolute;}
.vh{visibility: hidden;}
.dn{display: none;}
.oh{overflow: hidden;}

.boxShadow{border-radius: 3px; box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);}